Dishwashing machine



Nov-.24, 1931. AHQ E HAW 1,833,374

DI SHWA SHING MACHINE Filed May 14, 1926 4 Sheets-Sheet 1 3 Y 5 6 Z 7 (I A TTORNEYS.

NOV. 24, 1931. RENSHAW 1,833,374

DI SHWASHING MACHINE Filed May 14, 1926 4 Sheets-Sheet 2 IN V EN TOR.

F1 G. 2 MW' BY v A TTORNEYS.

Nov. 24, 1931. A, H, gqE-NsHAw 1,833,374

DI SHWASHING MACHI NE Fi y 1926 4 Sheets-Sheet 5 IN VEN TOR.

F155 mm ATTORNEYS.

Nov. 24, 1931. H, RE HAW 1,833,374

DISHWASHING MACHINE File M y 1926 4 Sheets-Sheet 4 INVENTOR.

A TTORNEYS.

I Patented Nov. 24,1931

UNITED STATES PATENT OFFICE ALFRED H. REN'SHA'W, OF NOBOTON, ('iONNECTIC'UT, ASSIGNOR, BY MESNE ASSIGN- KENTS, TO HENRY CAVE, OF HARTFORD, CONNECTICUT DISHWABHINQ MACHINE Application filed Kay 14, 1928. Serial No. 109,195.

This application relates to improvements in dishwashers of the type described in various patents and applications, more particularl thatiof H. Cave, Serial Number 561,686, (i May 17, 1922, now Patent No. 1,681,322, granted August 21, 1928.' It is the object of the present invention to produce a device of the above type which has various refinements tending to make the device more efficient and also improve its operating characteristics.

One-particular featureof the resent ap aratus is the method of control 0 the machlne. A second feature is the. inclusion of means whereby the motor is prevented from racing when-the water load is removed from the' 1 a vertical cross section throu h the tu of. the machine and the chamber w ich conta ns the strainer. Figure 2 is a partlal sect1onr through the operating and control mechanism taken in a plane transverse to that of Figure 1. Figure 3 is a horizontal section taken through w-a in Figure 1, showing the relae control valve, pump,

tive locations of t strainer, etc.

Figures 4, 5, 6 and 7 show the various positions of the control valve under d ifi'erent operating conditions of the washer.

Figure 8 is a bottom view of the switch which is used to control the motor.

Figure 9 .is a circuit diagram showing the electric circuits.

Referring specifically to Figure 1, I show adapted to rest against a support 6 on section 2 of the cover.

, tate.

The cover as a whole is fitted within a recess 7 in the tub 1, and is removable. The

tub is further provided with a bottom 8 in which is formed a sloping draining section 9, which is adapted to drain water out of the tub into an adjoining chamber 10, which will be hereafter described.

A wire rack 11 is provided and is equipped described in the above mentioned applicationv of Cave.

In order that the water for washing the dishes may be properly distributed over the dishes, a spray arm 15 is provided which has a series of oblique ports 16, arranged in such a manner that when water is. pouring from these holes it will impinge against the atmosphere and cause the spray arm to slowly ro- The spray arm is further rovided with a vertical tubular extension 1 having a spray cap or cover 18, equipped with spraying ports 19. The spray arm is adapted to be plvoted in a casting 20 carried in the bottom 8 and is held in a vertical position by means of an extension 21, enterin a suitable bore 22 in the'casting 20. This w ole assembly is provided with sufiicient clearance so that it may freely rotate in the casting 20. A latch 23 of suitable construction is adapted to hold the spray arm 16 in position and is so arranged that the spray arm may be readily tub and the spray arm.

From the above described construction, it

will be seen that if water is supplied under pressureto the tubular. part 24 of casting 20, that it will pass up through the spray arms 15 and extension, 17, causing the spray arm to rotate and to spray water over the dishes and silverware contained in the rack 11 in such a manner that all portions of the dishes and silverware will be rinsed thoroughly.

In order to maintain this spray of water under pressure, an electric motor 25 of suitable make is provided.- This is more clearly shown inFigure 2. The motor25 is adapted to be bolted in a vertical position to a housing, 26, by means of bolts or screws 27. It is provided with a couplin device 28 adapted to connect it to a. wertica shaft 29 journaled in bearings 30 and 31, respectively, and adapted to carry a screw impeller 32 as shown in Figure 2.

The impeller 32 is adapted to rotate in a passage 33, whereby upon its rotation, water is raised from the well 34 and forced through aperture 35 in the direction indicated by the arrow, through valve 36 to tubular member 37 and thence into the above mentioned casting 20, which is connected to tubular meming member 39 in chamber 10, back to well 34. The purpose of the strainer 39 is to filter out from the water any food particles which are washed from the dishes during the washing process. This strainer, made of suitable wire mesh, is providedwith a rim 40 adapted to rest on a ledge 41 and is further rovided with a handle 42, whereby it may be readily removed from chamber 10 for urposes of cleaning. Chamber 10 is provided with a renfovable cover 43 in order to enable access to be had to the filter 39.

Connected with valve 36 by means of a port 44, is a suitable filling and draining hose, 45. The method of filling and draining the machine will be described hereafter.

In order to control the operation of the motor, a suitable switch 46 is provided. This switch comprises a piece of insulating material 47, upon which are mounted contact studs 48, 49, 50 and 51 respectively. Adapted to co-act with these contact studs are two contact springs, 52 and 53' respectively. These contact springs are operated by means of tripper arms 54 and 55, pivotally mounted upon the insulating piece 47, by means of studs 56 and 57. The contact springs 52 and 53 are insulatively mounted on arms 58 and 59 by means of insulating blocks 89 and 90, said arms being pivoted at 60 and 61, these pivots being carried'by the insulating material 47 and adapted also to form stops for the members 54 and 55. Members 54 and 55 are connected to their respective members 58 and 59 by means of compression springs 62 and 63 at points 64, 65, 66 and 67 respectively. The machine is provided with a tripper arm 68, the mounting of which will described later, but which is adapted to swing through the are as described by the dot and dash line 69. It will be seen by referring to Fi re 8 that should this arm be moved in a cloc -wise direction, it will pass from under extension 70 of member 54 and will pass under extension 71 of this member, causing the member to rotate about its pivot 56 in a counter-clockwise direction, thereby changing the relative positions of points 64 and 65, whereby the spring 62 will force the contact member 52 away from the contacts 48 and 49. If we continue the movement of member 68 in a clockwise direction, it will pass under extension 72 of member 55 and will then pass under extension 73 of member 55, forcing this member to rotate in a counter clock-wise direction,

thereby causing the spring 63 to'assume a position which will force the contact member 53 into direct contact with studs 50 and 51. By this combination, it will be seen that I have provided a means whereby in one position of member 68 a circuit is closed between studs 48 and 49; in another osition all circuits will be open and in a still further position, the circuit will be closed between studs 50 and 51. The circuit which passes through studs 48 and 49 is the circuit which is closed when the machine is being drained and the v circuit which passes through studs 50 and 51 is the circuit which is used when the machine is functioning. I have shown in Figures 4, 5, 6 and 7 sections through valve 36 in its various operating positions, about which I have shown the control lever in a position corresponding to that assumed by the valve.

It will be understood by reference to Figure 2 of the drawings that the control lever 74 is rigidly connected to the valve 36 by means of a shaft 75, coupling 76 and valve shaft 77. A spring, 78, is provided and is arrangedto co-act between the top of the valve 36 and cover 88 in well 34, whereby valve 36 is retained on its valve seat 79.

In Figure 4 I show the valve 36 in the position in which it is set when dishes are being washed. It will be noted that in this position a free passage is provided from port 35 to port 1n the tubular member 37, thereby providing a directional passage which causes the water to ass as previously described when washing t e dishes. When the control lever 74 is turned to the stop position, as shownin Figure 5, it will be seen that the valve 36 has rotated a certain number of degrees in a clock-wise direction but not far enough to open port 44. In the stop position there has been no change in the path of circulation through the valve.

Figure 6 shows the valve 36 rotated to the filling position. It will be noted that port in the tubular member 37 has been closed and that port'44 has been opened. Port 44 as previously described connects to a filling hose 45 and when this is connected to a suitable supply of hot water and the water turned on, the water will flow through upper end of the impeller 32 and belowv the top of the strainer, thereby insuring that the impeller is completely submerged. and

at the same time insuring a free flow of water through the strainer 39. v

Figure 7 shows the valve in the emptying position. Should the motor be run when the valve is in this position, the water will be forcedfrom port 35 through valve 36, out through port 44, and hose 45, thereby discharging water from well 34 through the same hose which was used in filling the machine.

A special draining port, 87, is provided in the seat 79 of valve 36 and is adapted to be connected to tubular member 37 in the emptying position of the valve by means of a groove 91 formed in the valve 36, as shown in Figure 7. The purpose of this port is to allow water to readily drain from the spray arm 15 and its connecting members 20 and 37 and down into well 34, there by insuring the proper drainage of the machine and that it will-he promptly and completely emptied.

The member 68 that is adapted to oper-- ate the switch shown in Figure 8 is rigidly connected to the -shaft 75 of the control lever 74 and is so placed on this shaft in relation to the valve 36 that it will cause the switch 46 to function in proper sequence with the various positions of the valve 36,

"that is, the contact studs 50 and 51 will be electrically connected and the machine will be operated when the valve is in the washing position; all circuits will be opened when the valve is in the stop and filling positions; and contact studs 48 and 49 will be closed when the valve is in the emptying position.

Figure 9 shows the circuit connections passing through this switch for the control of the electric motor. When the machine is being used to wash dishes, the" circuit passes from the line L-l to contact post 86, through wire 83, to the motor 25, through wire 80 to contact stud 84, from this stud 84, through wire 81, to contact stud 50, through contact member 53 to contact stud 51,. through wire 82 to contact stud 49, to line L2. This will impress energy on the motor 25 and cause it to run at maximum speed, thereby developing maximum water pressure in the spray arm 15.

When the motor is being used to empty the machine, it has been found that 'when the load from the water is removed from the motor, it has a tendency to race. A resistance unit is thereforeprovided and in the emptying position the circuit is as follows:

from line L-l to contact stud 86, through wire 83 to motor 25, throughwire 80, to contact stud 84, through current limiting resistor 85, to contact stud 48, contact member 52, to contact stud 49, back to line L 2.

-It will be seen that with this circuit, a re 32, thereby causing the impeller to pick up water at two points diametrically opposite one another, he the case with the single pitch thread. This insures proper balance of the rotating instead of at one point as would I mechanism at all times and eliminates undue vibration and wear on the rotating ele-, ments and their bearings. 1

It will be understood by those skilled'in the art that many modifications may be made in the particular construction and details'of my invent-ion without departing from the spirit of the invention. 1

Having therefore. fully described one particular embodiment of my invention what I claim is 1. In a dishwashing machine, a washing compartment, an inlet pipe opening into the latter, electrically operated means for forcing liquid through said pipe, a switch for the control of said electrically operated means, a spray rotor in said compartment mounted in communication with said pipe, a valve for the control of the liquid flow through said pipe,a stem for the valve and operating handle therefor, and an arm carried by the valve stem for operating the switch for jointly controlling movements of the valve and switch to coordinate their operation during the functioning of the machine.

2.,In a dishwashing machine, a washing compartment, an inlet pipe opening into the latter, electrically operated means for forcing liquid through said pipe, a switch for the control'of said electrically operated means, a

spray rotor in said compartment communieating with said pipe and emptying and filling means" for the machine, a valve for the control of the liquid flow through said pipe and adapted to connect the electrically'operated means to the pipe or the emptying and filling means respectively, and a resistor associated with the switch to reduce the speed of the electrically operated means when the emptying means or said inlet ipe respectively, whereby said electrical y operated means may be caused to supply liquid under pressure to the washing compartment when the valve is in one position, and eject said liquid through the filling and emptying means when the valve is in another position, a. switch operatively connected with said valve to control the operation of the electrically operated means to accord with the position of said valve, and means associated with said switch wherebysaid electrically operated means runs at a reduced speed when emptying the machine.

4. In a dishwashing machine, a washing compartment, an inlet pipe provided in a wall of said compartment, electrically operated means for forcing liquid through said pipe, a common filling and emptying means, 'a valve adapted to connect said electrically operated means either with said filling and a emptying means or said inlet pipe respectively, whereby said electrically operated means may be caused to supply liquid under pressure to the washing compartment when the valve is in one position, and eject said of said compartment, a spray rotor in said compartment mounted in communication with said pipe, electrically operated means for forcing l quid through said pipe, a common filling and emptying means, a valve adapted to connect said electrically operated means either with said filling and emptying means or said inlet pipe respectively whereby said electrically operated means may be caused to supply liquid under pressure to the washing compartment when the valve is in one osition and eject said liquid through the lling and emptying means when t e valve is in another position, and said valve having a drain port adapted to drain the spiay rotor when the machine is being emptie In testimony whereof, I have signed my name to this specification.

A. H. RENSHAW.

liquid through the filling and emptying 7 means when the valve is in another position, a switch operatively connected with said valve to control the operation of the electrically operated means to accord with the position of said valve and a resistor associated with said switch whereby to cause said electrically operated means to run at a reduced speed when emptying the machine.

5. In a dishwashing machine, a washing compartment, an inlet pipe opening into the compartment, forcing means for forcing liquid through said pipe, a spray rotor in said compartment mounted in communicationr with said pipe, a valve for the control of the liquid flow through said pipe, means for jointly controlling said forcing means and said valve to coordinate their operation during the functioning of the machine, and said valve having a drain port adapted to drain the sprayrotor when the machine is being emptied.

6. In a dishwashing machine, a washing compartment, an inlet pipe provided in a wall of said compartment, electrically operated means for forcing liquid through said pipe, a valve to control liquid flowing through said pipe, a spray rotor located in said compartment in communication with said pipe, a

switch for the control of said electrically operated means, means for jointly controlling said switch and said valve whereby their functions are synchronized to properly control the operation of the dishwasher, and said valve having a drain port adapted to drain the spray rotor when the machine is being emptied;

7. In a dishwashing machine, a washing compartment, an inlet pipe provided in a wall 

